sokalSneath1 {partitionComparison}

Sokal & Sneath Index 1

Description

Compute the index 1 of Sokal and Sneath

\frac{1}{4} \left( \frac{N_{11}}{N_{21}} + \frac{N_{11}}{N_{12}} + \frac{N_{00}}{N'_{10}} + \frac{N_{00}}{N'_{01}} \right)

Usage

sokalSneath1(p, q)

## S4 method for signature 'Partition,Partition'
sokalSneath1(p, q)

## S4 method for signature 'PairCoefficients,missing'
sokalSneath1(p, q = NULL)

Arguments

p

The partition P or an instance of PairCoefficients

q

The partition Q or NULL

Methods (by class)

• sokalSneath1(p = Partition, q = Partition): Compute given two partitions

• sokalSneath1(p = PairCoefficients, q = missing): Compute given the pair coefficients

Author(s)

Fabian Ball [e-mail]

References

Sokal RR, Sneath PHA (1963). Principles of numerical taxonomy.. Freeman, San Francisco.

Examples

isTRUE(all.equal(sokalSneath1(new("Partition", c(0, 0, 0, 1, 1)), 
                             new("Partition", c(0, 0, 1, 1, 1))), 7/12))